Machine for sharpening pencils



DANDRIEUX MACHINE FOR SHARPENING PENCILS Original Filed May 22. 1922' Patented Get. 39, 192 3.

* entran earea'r,

'AUGLUSTE DANDBIEUX, on rams nnancn, .a'ssIeNoR'To SQCIETE ANONYME ANoI'ENs ATELIERS nannninux, on PARIS, FRANCE. r

MACHINE FOR SHARPENING PENCILS.

Application filed. May 22, 1922, Serial No. 562,786. Renewed September 27, 1923. I

T all whom it may concern) 3 Be it known that I, en'ensrn DANDRlEUX,

a citizen of the. French Republic, residing at 11 Rue Tournefort', Paris, France, have invented new and useful improvements in lilachines for Sharpening Pencils, of which the following is the specification. This invention relates to a. machine for sharpening pencils in which the'sharpening member is constituted by a circular plate carrying radial blades and ri'itating about an axis at right angles to its plane and such that the trace of the plate and the projection of the axis of the pencil on a plane parallel to the latter, and passing through the axis of the plate, form between them an angle equal to that ofa genera-trix with the axis of revolution of the cone formed at the end of the pencil-after sharpening.

A form of carrying out the present invention is illustrated by way of example in the accompanying drawing, in which:

Fig. 1 is a perspective view of the whole of the machine.

. F ig. 2 is a vertical section of the machine, the casing and centering device being removed.

Figs. 3 andl illustrate, in four different half-sections. the centering device for the pencil:

(a) Figure 3, left hand part; :half elevation of the whole of the centering'apparatus, the casing and cover'being cut away.

through a diametral plane.

' Fig. a, left hand part, half section of the cover and-of the device integral therewith through a diametral plane at right angles to the previous one. Y

Fig. 4, right hand part, correspontv ing half section, the cover alone being cut away.

Fig. 5 is an elevation of the cam.

Fig. 6 is a vertical section of the block supportin the axis of rotation of the blade plate and directing or guidinggthe pencil.

F ig. 7 is a corresponding elevation, showing thedevice for adjusting the length according to which the pencil is to be sharpened.

" A circular plate 1 carries blades 2, ja rranged according to radii formingbetween them angles which are preferably equal, but may also be different. In the present form part 5. This shaft is threaded at its'end 6 and receives a nut 7 for securing the plate I by means of a spring 8 adapted also to hold the flat part of the blades in contact with a plane face 9 of a block 10 through which passes the shaft 4 and serving as a bearin for the latter. The shaft 4 is also threaded atits other end, so as to permit of securing thereon a cam 11 by means of nut 12. 1 The cylindrical 'bore 14 of the block 10 which receives the shaft 4 has its axis at right angles to the plane face 9 on which rub the blades. The block 10 is provided, moreover, with a conical bore '13, the projcction of the axis" of the cone on a: plane parallel to it and'passing' throughthe axis, of'the bore ltmakes', with the trace of' .the surface v9 on this plane, an'angle which will be equal to the angle formed by ageneratfix a F 3, right hand part, half section the end of the pencil.

' The axis of the bore 13 makeswith the and the axis ofrevo'lution ofthe cone cutat plane surface 9 an angle smallerthanthat it makes with a generatrix theboreand is placedin such a manner that the surface Q IH'GQTSGC'GS thO conical surface of the bore .fl3 ofl which it contains the apex. It results .therefrom that this here opens on the surface 9 by an opening limited by two-nonparallel straight lines. Tl'l ;'bOIB 13 being terminatedatits upper part by a cylindrical portion,- the opening is closedon this side by anarcof ellipsis; moreover, it might not be closed.

@n the other hand, the-block lOiisseoured on a sheet-iron fra'me 45, by screws .15aor1by' a Fig. 8 is an elevation of the blade carrying gplate.

any other suitable means; besides, the nut 7 is provided with a circular projection with flat parts 16, on which a crank 17 is secured by means of a milled nut i8.

On a lug 19 of the frame i5 is mounted a wheel 20 perforated with a central hole and directly receiving a rotary movement from the cam 11 in the following manner:

The cam 11 is formed of three equal arcs of circumference, but the centres of which are at the apex of an equilateral triangle; these arcs are terminated by segments of radius. In the present form of construction, they are obtained by embossing of the plate ll. Between two arcs is provided a determined space, equal to the thickness of a tooth of the wheel 20. This wheel is formed with such'teeth that their sides and that of the cam, when they are in contact, have the same tangent plane at the point of contact.

Consequently for a rotation of in of the cam 11 the wheel 20 rotates to the extent of one tooth; the speed of this wheel is therefore obviously a function of its number of teeth. t is moreover possible to replace the cam and toothed wheel device which has just been described by any other system giving the same result and in particular by a suitable hyperbolic gearing.

In the central cylindrical bore of the wheel 20 is mounted a centering device for the pencil. The pencil is clamped between two rolls'21 having the shape of a solid obtained by putting together the small bases of two conic frusta; these two rolls are each mounted on an axis 22 to the ends of which are pivoted arms 23 pivoted together at 2i and arms 25 integral with lug levers 26 pivoted at 27. On each of the axes 27 is mounted a. returning spring 28 which tends to space apart both lugs 26 and consequently to bring together the rolls 21 clamping the pencil between them. The whole is mounted on a frame 29 made integral with the cover by the lugs 26; this cover is secured by screws on a casing 81 the lower cylindrical part 32 of which is forced into the cylindrical bore of the wheel20.

The operation is as follows: 7

Centering 0f the pencil.lt sufiices to force the pencil within the centering device; the pencil is guided by the bore 13 and by the rolls 21 which clamp it between them. Theserolls are provided with circular projections which cause the pencil to participate to the rotary movement of the device.

S. z arpe7 tz'ng.l3y turning the .crank 17,

the cutters 2 successively come in front of the opening through which opens the bore 13 and cut the wood extending outward, exerting at the same time a tractive stress tending to move the pencil forward. Si multaneously, the cam 11 rotates and drives the wheel 20. The pencil is automatically subjected to a rotary movement about its with any automatic feeding system, the feeding movement being obtained by the tractive stress of the blades cutting the wood.

An adjustable abutment device is provided allowing to sharpen the pencil with a more or less fine point. A rod 33, forming a hook at 34;, is provided with a notch const-ituting two steps at 85; these steps can be brought under the point of the pencil, so as to limit its downwardmovement. The rod 33 is bent so as to form three folds 36 in order to constitute indentments determining the position of the notch when abutting against the wall of the block 10 against which the slightly resilientrod 33 is pressed, a screw 37 holds this rod on the frame 45, by an elongated hole 38 forming a slide. The rod can slide, moreover, through a hole 59 provided in the frame and having the same cross-section as the rod. V

This device also serves to discharge the broken leads which eventually obstruct the bore 13; itsufiices to impart to the rod 33 a rapid to and from movement to crush the broken lead into small fragments which fall in the drawer -i0 adapted to receive the chips and to easily drive them away.

The apparatus is enclosed'in an outer casing d1; this casing is provided with a circular opening into which is forced a disc 43, made of mica or any other translucent ma:

terial, mounted in a circular armature 44: 3

allowing one to see'the blade carrying plate.

These arrangements which are simply used for protecting the parts and for aesthetic purposes may obviously receive any suitable forms. on the support l2 integral with the frame on which it is secured by screws or any other means. V

The blade-carrying plate might be replaced by any other rotating member allowing to sharpen by cutting or wearing down the end of the said pencil according to a cone, this member having its axis of rotation inclined in such a manner that the projection of the axis of the pencil on aplane parallel to this axis passing through'the axis of rotation of the sharpening member, makes with a perpendicular raised on this latter axis and in this plane, an angle equal to the angle of a generatrix with the axis of the cone, after sharpening.

Besides, it is possible to obtain avariable inclination of the blade-carrying plate relativoly to the axis of the pencil, so as to modify the cone cut at the end of the pencil, ccording to the nature of the latter, by any T he casing i1 bears at its lower part suitable device permitting to give to the axis 4 angular displacements in a vertical'plane. What I claim as my inventionjand' desire to secure by Letters Patent is: 1. in machine for sharpening pencils, a circular plate, radial blades carried by the said plateand the sharp edges of which are in the same plane, an axis of rotation at right angles to this plane andon which the said plate is rigidly secured, a frame supporting the said axis, a surface of this frame 2. In a machine for sharpening pencils,'a

circular plate, radial blades carried by the said plate and the sharp edges of which are in the same plane, an axis of rotation'lat right angles to this plane and on which the said plate is rigidly secured, a frame supporting the said axis, a surface .of this frame coinciding with the plane'of' the blades, a conical holein-this frame, opening laterally on the said surface, a cylindrical socket mounted on the frame so as to be capable of rotating about its axis which coincides with that of the conical hole, a support within this socket, two opposite clips pivoted on this support, means for resiliently bringing back these two clips, equal levers pivoted on the clipsand together, slides on the said inner support, through which pass the pivoting axes connecting the levers together, means'for rotating the blade-carrying plate, means-f for rotating the pencil about its axis.

. 3; In a machine forfsharpening pencils a circular plate, radial blades carried hylthe said plate and the sharp edges.of, wh1ch are in the same plane, an axisof rotation at right angles to this plane andon which, the said plate is rigidly secured, a frame supporting the said axis, a surface of this frame coinciding with the plane, ofythe blades, a conical hole in thisframe, opening laterally onthe said surface, acylindrical socket mounted on the frame so as to, be

capable of rotating about its .axiswhich coincides with that of the conical -hole,a support within this socket, two opposite clips pivoted on this support,rmeans for resiliently bringing baokr these two clips, equal levers pivoted on the clips and together, slides on the said inner support,

through which pass the pivoting 'axes'connecting the levers together, rolls in 3 the shape of a double frusturn carried by the clips, circular ribs on the said rolls rendera ing the pencil inte'gral with the socket for the rotary movement, means for rotating the blade carrying plate, means for rotating the socket. g 7 4 g r 4 a 7 l, In" a machine for sharpen ng: pencils, a circularplate, radial blades carried bythe said plate and the sharp edges of'which are the same in plane, and axis of rotation at right angles tothis plane and on whichsthe said plate is rigidly secured, a frame supporting the, said axis, ;a surface of this' frame coinciding with the plane of'the blades, a conical hole in thisframe, opening laterally on the said surface,acylindrical socket mounted on" the frame S's-as to be capable of rotating about its axis which coincides with that of the 'conical "hole, a support within this; socket, two opposite clips pivoted on this support, means "for resiliently. bringing back these two clips, equal levers pivoted on the clips and to gether, slides. of the said inner'support,

through which pass the pivoting axes co nnecting the levers together, rolls" in the shape of' a double-frustum carried/bythe clips, circular ribs ion thesa'id rolls rendering the pencil integral with the socket for the rotary movement, a screw thread on the axis of rotation of'the pl'ate, a nut, a spring" taking av bearing on this nut and on the plate, a polygonal projection onlthisnut', a crank mounted on this projection, a locking nut for the crank, means" for transmitting the rotation from the axis of the plate jto the socket. a v a. a

5. In a machine for sharpening, pencils,

said plate and the sharp edges of which are in the same plane, an axis of rotation at right angles to this plane and on which the said plate is rigidly secured, a frame supporting the said axis, a surfacer of'this frame coinciding with the plane ofthe blades, a conical hole in this frame, opening. laterally on the said surface,'a cylindrical a socket mounted onlthe frame sofas to be' capable of rotating about 'its 'axis which coinCides with thatof thecoiiicalhole, a. support within this socket,-utwo opposite clips pivoted ontliis support, means for resiliently bringing back these. two' clips,-

equal levers v pivoted on the clips, together, slides of the "said inner support, through which pass the pivoting axes connecting the levers together, rolls in the. shape of a double frustum carried by the clips, circular ribs on the said rolls rendering the pencil integral with thesocket for the rotary movement, a screwthread on the axis ofrotat'ion of the plate, nut, a spring taking a bearing on thisnut and on the plate,

a circular plate, radial. blades carried bythe ill) ' movement, a screw a polygonal projection on this nut, a crank mounted on this projection, a locking nut for the crank, a cam rigidly secured on the axis of rotation of the plate, a toothed wheel rigidly secured on the socket and combined with the said cam.

6. In a machine for sharpening pencils,

a circular plate, radial blades carried by the said plate and the sharp edges of which are in the same plane, an axis of rotation at right angles to this plane and on which the said plate is rigidly secured, a frame supporting the said axis, a surface of this frame coinciding with the plane of the blades, a conical hole in this frame, opening laterally on the said surface, a cylindrical socket mounted on the frame so as to be capable of rotating about its axis which coincides with that of the conical hole, a support within this socket, two opposite clips pivoted on this support, means for resiliently bringing back these two'clips, equal levers pivoted on the clips and together, slides of the said inner support, through which pass the pivoting axes connecting the levers together, rolls in the shape of a double frustum carried by the clips, circular ribs on the said rolls rendering the pencil integral with the socket for the rotary movement, a screw thread on the axis of rotation of the plate, a nut, a spring taking a bearing on this nut and on the plate, a polygonal projection on this nut, a

crank mounted on this projection, a locking nut for the crank, a cam rigidly secured on the axis of rotation of the plate, a toothed wheel rigidly secured on the socket and combined with the said cam, means for adjusting the length of cutting or sharpening of the pencil lead.

7. In a machine for sharpening pencils, a circular plate, radial blades carried by the said plate and the sharp edges of which are in the same plane, an axis of rotation at right angles to this plane and on which the said plate is rigidly secured, a frame supporting the said axis, a surface of this frame coinciding with the plane of the blades, a conical hole on this frame, opening laterally on the said surface, a cylindrical socket mounted on the frame so as to be capable of rotating about its axis which coincides with that ofthe conical hole, a support within this socket, two opposite clips pivoted on this support, means for resilientlybringing back these two clips, equal levers pivoted on theclips and together, slides of the said inner support, through which pass the pivoting axes 'connecting the levers together, rolls inthe shape of a double frustum carried by the clips, circular ribs on the said rolls rendering the pencil integral with the socket for the rotary thread on the axis of the plate, a nut, aspring taking a bearing on this nut and on the plate, a polygonal projection on this nut, a crank rotation of mounted on this projection, a locking nut for the crank, a cam rigidly secured on the axis of rotation of the plate, a toothed wheel rigidly secured on the socket and combined with the said cam, a movable rod, notches of different depths in this rod, means for guiding and locking the said rod.

8. In a machine for sharpening pencils, a circular plate, radial blades carried by the said plate and the sharp edges of which are in the same plane, an axis of rotation at right angles to this plane and on which the said plate is rigidly secured, a frame supporting the said axis, a surface of this frame coinciding with the plane of the blades, a conical hole in this frame, opening laterally on the said surface, a cylindrical socket mounted on the frame so as to be capable of rotating about its axis which coincides with that of the. conical hole, a support within this socket, two opposite clips pivoted on this support, means for resiliently bringing back these two clips, equal levers pivoted on the clips and together, slides of the said inner support, through which pass the pivoting axes connecting the levers together, rolls in the shape of a double frustum carried by the clips, circular ribs on the said rolls rendering the pencil integral with the socket for the rotary movement, a

screw thread on the axis of rotation of the plate, a nut, a spring taking a bearing on this nut and on the plate, a polygonal projection on this nut, a crank mounted on this projection, a locking nut for the crank, a.

cam rigidly secured on the axis of rotation of the plate, a toothed wheel rigidly secured on the socket and combined with the said cam, a movable rod, notches of different depths in this rod, slides on the frame, pro- .jections carried by the said rod permitting the locking of the same.

9. In a machine for sharpening pencils, a circular plate. radial blades carried by the said plate and the sharp edges of which are in the same plane, an axis of rotation at right angles to this plane and on which the said plate is rigidly secured, a frame supporting the said axis, a surface of this frame coinciding with the plane of the blades," a,

conical hole in this frame, opening laterally on the said surface, a cylindrical socket mounted on the frame so as to be capable of rotating about its axis which coincides with that of the conical hole, a support H within this socket, two opposite clips pivoted on this support, means for resiliently bringingback these two clips, equal levers pivoted on the clips and together, slides of the said inner support, through which pass the pivoting axes connecting the levers to-' gether, rolls in the shape of a double frustum carried by the clips, circular ribs on r the said rolls rendering the pencil integral with the socket for the rotary movement, a i

screw thread on the axis of rotation of the cam, a movable rod, notches of different plate, a nut, a spring taking a bearing on depths in this rod, slides on the frame, pro- 7 this nut and on the plate, a polygonal projections carried by the said rod permitting jection on this nut, a crank mounted on this the locking of the same, a casing enclosing projection, a locking nut for the crank, a thewhole, a drawer for receiving the chips.v cam rigidly secured on the axis of rotation In testimony whereof I have signed my of the plate, a toothed wheel rigidly secured name to this s ecification.

on the socket and combined with the said A%GUSTE DAND'RIEUX. 

